NetBSD/lib/csu/powerpc/crt0.c

/*	$NetBSD: crt0.c,v 1.13 1999/03/19 23:55:17 thorpej Exp $	*/

/*
 * Copyright (c) 1995 Christopher G. Demetriou
 * All rights reserved.
 *
 * Modificiations for NetBSD/powerpc by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Christopher G. Demetriou
 *	for the NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/exec.h>
#include <sys/syscall.h>

#include <stdlib.h>
#ifdef DYNAMIC
#include <dlfcn.h>
#include "rtld.h"
#else
typedef void Obj_Entry;
#endif

/*
 * Lots of the chunks of this file cobbled together from pieces of
 * other NetBSD crt files, including the common code.
 */

extern int	__syscall __P((int, ...));
#define	_exit(v)	__syscall(SYS_exit, (v))
#define	write(fd, s, n)	__syscall(SYS_write, (fd), (s), (n))

#define _FATAL(str)				\
	do {					\
		write(2, str, sizeof(str));	\
		_exit(1);			\
	} while (0)

static char	*_strrchr __P((char *, char));


char	**environ;
char	*__progname = "";
struct ps_strings *__ps_strings = 0;

extern void	_init __P((void));
extern void	_fini __P((void));

#ifdef DYNAMIC
void		_rtld_setup __P((void (*)(void), const Obj_Entry *obj));

const Obj_Entry *__mainprog_obj;

/*
 * Arrange for _DYNAMIC to be weak and undefined (and therefore to show up
 * as being at address zero, unless something else defines it).  That way,
 * if we happen to be compiling without -static but with without any
 * shared libs present, things will still work.
 */
asm(".weak _DYNAMIC");
extern int _DYNAMIC;
#endif /* DYNAMIC */

#ifdef MCRT0
extern void	monstartup __P((u_long, u_long));
extern void	_mcleanup __P((void));
extern unsigned char _etext, _eprol;
#endif /* MCRT0 */

/*
 * First 5 arguments are specified by the PowerPC SVR4 ABI.  The
 * last argument, ps_strings, is a NetBSD extension.
 */
void _start __P((int, char **, char **, const Obj_Entry *,
		void (*) __P((void)), struct ps_strings *));

void
_start(argc, argv, envp, obj, cleanup, ps_strings)
	int argc;
	char **argv, **envp;
	const Obj_Entry *obj;			/* from shared loader */
	void (*cleanup) __P((void));		/* from shared loader */
	struct ps_strings *ps_strings;		/* NetBSD extension */
{
	char *namep;

	if ((namep = argv[0]) != NULL) {	/* NULL ptr if argc = 0 */
		if ((__progname = _strrchr(namep, '/')) == NULL)
			__progname = namep;
		else
			__progname++;
	}

	environ = envp;

	if (ps_strings != (struct ps_strings *)0)
		__ps_strings = ps_strings;

#ifdef DYNAMIC
	if (&_DYNAMIC != NULL)
		_rtld_setup(cleanup, obj);
#endif

#ifdef MCRT0
	atexit(_mcleanup);
	monstartup((u_long)&_eprol, (u_long)&_etext);
#endif

	atexit(_fini);
	_init();

	exit(main(argc, argv, environ));
}

/*      
 * NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
 */     
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: crt0.c,v 1.13 1999/03/19 23:55:17 thorpej Exp $"); 
#endif /* LIBC_SCCS and not lint */

#include "common.c"